Closed motor provided with internal and external cooling air paths
By designing the internal and external cooling air path in a compact motor, using the air ducts of the air inlet, thermal fixtures and air outlets, combining the heat dissipation fins and external air ducts, the problem of poor heat dissipation effect of the motor is solved, and the internal and external air ducts are realized The effect of double-layer heat dissipation.
Patent Information
- Application Number
- CN202411357759.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-27
- Publication Date
- 2024-12-17
AI Technical Summary
Compact-structured motors have challenges in cooling, especially due to limited internal space and difficulty in smooth airflow through narrow spaces, resulting in poor heat dissipation.
A closed motor with internal and external cooling air paths is designed. The airways are formed between the inner and outer shells, thermally conductive fixtures and air outlets, and the heat dissipation fins and external airways are combined to form internal and external doubles. The air path is layered to improve the heat dissipation capacity.
The double-layer heat dissipation effect inside and outside the motor is achieved, the overall heat dissipation ability is improved, and the problem of airflow in a compact structure is overcome.
Smart Images
Figure CN119154566A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of air-cooled motors, and more particularly to a closed motor provided with internal and external cooling air passages. Background Art
[0002] In motor design and application, heat dissipation has always been one of the key factors affecting motor performance, life and safety. As an energy conversion device, the motor will generate a lot of heat during operation, mainly due to the resistance loss when the current passes through the wire, the eddy current loss in the iron core, and the hysteresis loss caused by the change of the magnetic field. If this heat cannot be dissipated in time and effectively, it will cause the internal temperature of the motor to rise, thereby affecting the insulation performance and lubrication system of the motor.
[0003] Traditionally, there are two main ways to dissipate heat from motors: one is to conduct heat through heat dissipation fins, and the other is to use a built-in fan to force convection. The heat dissipation fins use the thermal conductivity of the material to transfer the heat generated inside the motor to the fins with a larger heat dissipation area, and then dissipate it to the surrounding environment through natural convection or radiation. The built-in fan uses the airflow generated by high-speed rotation to force the heat inside the motor to be taken away, achieving rapid cooling.
[0004] However, these two methods face significant limitations when applied to certain types or structures of motors. In particular, for motors with compact structures and limited internal space, the complexity of their internal structures poses a huge challenge to heat dissipation design. Specifically, the interior of the motor is mainly composed of a stator, a rotor, a shaft, and related support and insulation components. The stator is usually fixed and has a coil wound around it. It interacts with the rotating rotor through the principle of electromagnetic induction to drive the motor to operate. The rotor is mounted on the shaft and rotates with the shaft. It may also contain components such as permanent magnets or induction coils.
[0005] In this compact structure, the gap between the stator and the rotor, as well as the gap between the rotor and the shaft, is often designed to be very small to optimize the performance and efficiency of the motor. However, this design also makes it difficult for airflow to pass smoothly through these narrow spaces, thus limiting the heat dissipation effect. In addition, the insulation materials and bearing lubricants inside the motor may also hinder the flow of airflow, further exacerbating the heat dissipation problem. Summary of the invention
[0006] The present invention provides a closed motor with internal and external cooling air passages, the purpose of which is to improve the heat dissipation capacity of the motor through the internal and external air passages.
[0007] The above purpose is achieved through the following technical solutions:
[0008] A closed motor with internal and external cooling air paths comprises an inner shell, wherein a stator, a rotor and a shaft are sequentially arranged inside the inner shell from the outside to the inside, and the motor is characterized in that an air inlet and an air outlet are respectively formed on the left and right sides of the inner shell, a heat-conducting fixture is fixedly connected to the inner wall of the inner shell, the stator is fixedly connected to the inner wall of the heat-conducting fixture, an inner cover is detachably connected to the left and right ends of the inner shell, the shaft is rotatably connected to the two inner covers, a heat dissipation fin is fixedly connected to the outer wall of the inner shell, an outer shell is sleeved on the inner shell, the inner wall of the outer shell is fixedly connected to the heat dissipation fin, an outer cover is detachably connected to the left and right ends of the outer shell, the air guide hole is arranged on the outer cover, and the shaft is rotatably connected to the two outer covers.
[0009] The heat-conducting fixing part includes heat-conducting ribs distributed around the axis, and a left-right conductive air channel is formed between any two adjacent heat-conducting ribs, and a convex ring is fixed to the left and right parts of the inner walls of all the heat-conducting ribs; the stator is clamped between the two convex rings, and the outer end face of the stator is in contact with the inner end face of all the heat-conducting ribs, and the outer end face of all the heat-conducting ribs is in contact with the inner end face of the inner shell.
[0010] The air inlet and the air outlet are respectively located on the left and right sides of the heat conducting ribs.
[0011] The air inlet and outlet holes are distributed one above and one below.
[0012] An extension shell is detachably connected between the outer shell and the outer cover on the right side, and a fan blade located in the extension shell is fixedly connected to the shaft.
[0013] A first rotating sealing ring is installed between the inner cover and the shaft, and a second rotating sealing ring is installed between the outer cover and the shaft.
[0014] It also includes a first closure, which includes a first base, a screw is screwed into the first base through threaded cooperation, a guide rod is fixedly connected to the screw, and a first sealing head is fixedly connected to the end of the guide rod away from the screw, two sockets are provided on the outer shell, two first bases are fixedly connected to the outer shell, two guide rods are respectively inserted into the two sockets, and two first sealing heads are respectively inserted into the air inlet and the air outlet.
[0015] The inner shell is provided with chamfered surfaces on the peripheral edges of the air inlet and the air outlet.
[0016] It also includes a second closure device, which includes a second base. The left end of the second base is fixedly connected to an extension rod, and the left and right ends of the extension rod are respectively fixedly connected to a second sealing head. The second sealing heads on the left and right sides are respectively inserted into the air guide holes on the left and right sides.
[0017] The outer edge of the air guide hole at one end of the outer cover facing the second base is provided with a chamfered surface.
[0018] The beneficial effects of the enclosed motor provided with internal and external cooling air passages of the present invention are as follows:
[0019] The heat sink fins are in a relatively closed space and form an external airway to dissipate the heat inside the motor. At the same time, the airflow of the external airway is used to dissipate the heat. The air inlet, the airway of the heat-conducting fixture and the air outlet form an internal airway to directly dissipate the heat inside the motor. This improves the heat dissipation capacity. BRIEF DESCRIPTION OF THE DRAWINGS
[0020] Figure 1 It is a front view of a closed motor with internal and external cooling air passages;
[0021] Figure 2 A top view of a closed motor with internal and external cooling air ducts;
[0022] Figure 3 It is a right side view of a closed motor with internal and external cooling air passages;
[0023] Figure 4 It is a cross-sectional view of a closed motor provided with internal and external cooling air passages;
[0024] Figure 5 The internal structure of a closed motor with internal and external cooling air ducts Figure 1 ;
[0025] Figure 6 The internal structure of a closed motor with internal and external cooling air ducts Figure 2 ;
[0026] Figure 7 The internal structure of a closed motor with internal and external cooling air ducts Figure 3 ;
[0027] Figure 8 is a schematic diagram of the structure of a heat-conducting fixing member;
[0028] Fig. 9 It is a schematic diagram of the structure of the outer cover and the air guide hole;
[0029] Fig.10 is a schematic structural diagram of a first closure;
[0030] Fig.11 It is a schematic structural diagram of the second closure.
[0031] In the figure: inner shell 101, air inlet 101a, air outlet 101b, heat dissipation fins 101c, heat-conducting fixing parts 102, stator 103, rotor 104, shaft 105, inner cover 106, first rotating sealing ring 107, fan blades 108, outer shell 201, extension shell 201a, socket 202, outer cover 203, air guide hole 204, second rotating sealing ring 205, first base 301, screw 302, guide rod 303, first sealing head 304, second base 401, extension rod 402, second sealing head 403. DETAILED DESCRIPTION
[0032] A closed motor with internal and external cooling air paths, such as Figures 4 to 8 As shown, it includes an inner shell 101 of an annular wall body, the inner shell 101 is conductive on the left and right, and a heat-conducting fixing part 102 is fixed on the inner wall of the inner shell 101. The heat-conducting fixing part 102 includes heat-conducting ribs distributed around the axis of the shaft 105, and an air passage that is conductive on the left and right is formed between any two adjacent heat-conducting ribs, and a convex ring protruding from all the heat-conducting ribs in the axial direction of the shaft 105 is fixed by welding on the left and right parts of the inner walls of all the heat-conducting ribs. One of the convex rings is welded after the stator 103 is installed; the stator 103 is clamped between the two convex rings, and the outer end face of the stator 103 is fitted with the inner end face of all the heat-conducting ribs. The heat-conducting ribs are preferably made of the same material, and the outer end faces of all the heat-conducting ribs are fitted with the inner end face of the inner shell 101 to achieve heat conduction. Among them, the rotor 104 is rotatably connected in the stator, and the shaft 105 is fixed in the stator.
[0033] To further illustrate, an air inlet 101a and an air outlet 101b are respectively formed on the left and right sides of the inner shell 101. The air inlet 101a and the air outlet 101b are respectively located on the left and right sides of the thermal conductive ribs to be connected with the airway. The air inlet 101a and the air outlet 101b are distributed up and down, so that the airflow can better enter the entire airway, thereby dissipating the heat inside the motor. The left and right ends of the inner shell 101 are detachably connected to an inner cover 106, the shaft 105 is rotatably connected to the two inner covers 106 through the first rotating seal ring 107 and the bearing, the outer wall of the inner shell 101 is fixedly connected to the circumferentially uniformly distributed heat dissipation fins 101c, the inner shell 101 is sleeved with an outer shell 201, the inner wall of the outer shell 201 is fixedly connected to the heat dissipation fins 101c, and a second air channel is formed between any two adjacent heat dissipation fins 101c, the left end of the outer shell 201 is detachably connected to an outer cover 203, the right end of the outer shell 201 is connected to an extended shell 201a, and the right end of the extended shell 201a is connected to another outer cover 203, so that the bolt passes through the outer cover 203 on the right side from right to left and the bolt is screwed into the internal threaded hole at the right end of the extended shell 201a through threaded matching to complete the detachable connection. The fan blade 108 located in the extended shell 201a is fixedly connected to the shaft 105. The outer cover 203 is provided with an air guide hole 204 , and the shaft 105 is rotatably connected to the two outer covers 203 .
[0034] When the motor is working, the heat sink 101c is used to dissipate the heat inside the motor, and the shaft 105 drives the fan blades 108 to rotate around the axis of the shaft 105. The air enters from the air guide hole 204 on the right side, and then enters the second air duct to dissipate the heat from the heat sink 101c, forming external heat dissipation; the air flow will also pass through the air inlet 101a at the lower right, the air duct of the heat-conducting fixing 102, and the air outlet 101b in sequence, so as to directly dissipate the heat inside the motor. In this way, internal and external double air paths are formed for heat dissipation, and the internal and external air paths are respectively in two layers of the outer shell, forming a double layer of protection for the motor.
[0035] When the motor needs to be sealed, in combination with the other drawings, a first sealer is also included, which includes a first base 301, a screw 302 is screwed into the first base 301 through threaded cooperation, a guide rod 303 is fixedly connected to the screw 302, and a first sealing head 304 is fixedly connected to one end of the guide rod 303 away from the screw 302. Two sockets 202 are provided on the housing 201, and the two first bases 301 are fixedly connected to the housing 201. The two guide rods 303 are respectively inserted into the two sockets 202. The two guide rods 303 can move away from or close to the shaft 105 relative to the housing 201. When the guide rods 303 are located in the corresponding sockets 202, the sockets 202 are closed, and the two first sealing heads 304 are respectively inserted into the air inlet 101a and the air outlet 101b to complete the sealing of the air inlet 101a and the air outlet 101b;
[0036] The screw 302 is rotated to drive the guide rod 303 to move away from or towards the shaft 105 relative to the housing 201. When moving away, the purpose is to open the air inlet 101a and the air outlet 101b, and vice versa, the air inlet 101a and the air outlet 101b are blocked. The positioning of the screw 302 is achieved by the self-locking property of the thread. The self-locking property is mainly achieved by the material of the screw. The higher the hardness, the stronger its ability to resist loosening due to external forces, that is, the better the self-locking property. Or it can be described by the shape of the thread, that is, the inclination angle of the thread, that is, the helix angle, the pitch and the thread tooth profile. When the thread lead angle is less than the equivalent friction angle of the helical pair, the thread connection has a self-locking characteristic. Therefore, a smaller thread lead angle helps to improve the self-locking performance. The smaller the pitch, the smaller the thread lead angle, thereby enhancing the self-locking performance. Different tooth profile designs will affect the friction resistance and contact area of the thread, and thus affect the self-locking performance. For example, triangular threads usually have better self-locking performance due to their stable geometric shape and large contact area. A protrusion may be fixedly connected to one end of the screw rod 302 away from the axis, so that a wrench can clamp and rotate the screw rod 302 .
[0037] Similarly, a second closure is also included, which includes a second base 401, an extension rod 402 is fixedly connected to the left end of the second base 401, and a second sealing head 403 is fixedly connected to the left and right ends of the extension rod 402. When the second base 401 is attached to the right end surface of the right outer cover 203, the second sealing heads 403 on the left and right sides are respectively inserted into the air guide holes 204 on the left and right sides, thereby closing the air guide holes 204. When the second base 401 moves to the right, the second sealing heads 403 on the left and right sides are respectively separated from the air guide holes 204 on the left and right sides. The extension rod 402 can pass through the air passage of the heat-conducting fixing member 102.
Claims
1. A closed motor with internal and external cooling air paths, comprising an inner shell (101), wherein a stator (103), a rotor (104) and a shaft (105) are sequentially arranged inside the inner shell (101) from the outside to the inside, wherein: An air inlet (101a) and an air outlet (101b) are respectively formed on the left and right sides of the inner shell (101); a heat-conducting fixing part (102) is fixedly connected to the inner wall of the inner shell (101); the stator (103) is fixedly connected to the inner wall of the heat-conducting fixing part (102); the left and right ends of the inner shell (101) are each detachably connected to an inner cover (106); the shaft (105) is rotatably connected to the two inner covers (106); the outer wall of the inner shell (101) is fixedly connected to a heat dissipation fin (101c); the inner shell (101) is sleeved with an outer shell (201); the inner wall of the outer shell (201) is fixedly connected to the heat dissipation fin (101c); the left and right ends of the outer shell (201) are each detachably connected to an outer cover (203); the outer cover (203) is provided with an air guide hole (204); and the shaft (105) is rotatably connected to the two outer covers (203).
2. The enclosed motor with internal and external cooling air passages according to claim 1, characterized in that: The heat-conducting fixing member (102) comprises heat-conducting ribs distributed around the circumference of the shaft (105), a left-right conductive air passage is formed between any two adjacent heat-conducting ribs, and a convex ring is fixedly connected to the left and right parts of the inner walls of all the heat-conducting ribs; the stator (103) is clamped between the two convex rings, and the outer end surface of the stator (103) is in contact with the inner end surface of all the heat-conducting ribs, and the outer end surfaces of all the heat-conducting ribs are in contact with the inner end surface of the inner shell (101).
3. The enclosed motor with internal and external cooling air passages according to claim 2, characterized in that: The air inlet (101a) and the air outlet (101b) are respectively located on the left and right sides of the heat-conducting ribs.
4. The enclosed motor with internal and external cooling air passages according to claim 2 or 3, characterized in that: The air inlet (101a) and the air outlet (101b) are distributed one above and one below.
5. The enclosed motor with internal and external cooling air passages according to claim 1, characterized in that: An extension shell (201a) is detachably connected between the outer shell (201) and the outer cover (203) located on the right side, and a fan blade (108) located in the extension shell (201a) is fixedly connected to the shaft (105).
6. The enclosed motor with internal and external cooling air passages according to claim 5, characterized in that: A first rotating seal ring (107) is installed between the inner cover (106) and the shaft (105), and a second rotating seal ring (205) is installed between the outer cover (203) and the shaft (105).
7. The enclosed motor with internal and external cooling air passages according to claim 1, characterized in that: The invention also comprises a first closure device, which comprises a first base (301), a screw rod (302) being screwed into the first base (301) by threaded engagement, a guide rod (303) being fixedly connected to the screw rod (302), a first sealing head (304) being fixedly connected to one end of the guide rod (303) away from the screw rod (302), two sockets (202) being arranged on the outer shell (201), two first bases (301) being fixedly connected to the outer shell (201), two guide rods (303) being respectively inserted into the two sockets (202), and two first sealing heads (304) being respectively inserted into the air inlet (101a) and the air outlet (101b).
8. The enclosed motor with internal and external cooling air passages according to claim 7, characterized in that: The inner shell (101) is provided with chamfered surfaces on the peripheral edges of the air inlet (101a) and the air outlet (101b).
9. The enclosed motor with internal and external cooling air passages according to claim 5, characterized in that: The second closure device also includes a second base (401), the left end of the second base (401) is fixedly connected to an extension rod (402), the left and right ends of the extension rod (402) are respectively fixedly connected to a second sealing head (403), and the second sealing heads (403) located on the left and right sides are respectively inserted into the air guide holes (204) located on the left and right sides.
10. The enclosed motor with internal and external cooling air passages according to claim 9, characterized in that: The outer edge of the air guide hole (204) at one end of the outer cover (203) facing the second base (401) is provided with a chamfered surface.